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IS online_test_unit10a
Chapter 10 Common Acids and Alkalis
1. Which of the following metals does not react with dilute hydrochloric acid?
(A) Aluminium
(B) Magnesium
(C) Zinc
(D) Copper
2. Nitric acid (HNO3) turns blue litmus paper red. Sodium hydroxide (NaOH) turns red litmus paper blue. If nitric acid and sodium hydroxide are mixed in the right proportion, the resulting solution will not cause red or blue litmus paper to change colour.
Which of the following could be the correct explanation(s)?
(1) Nitric acid and sodium hydroxide mix together to form water and salt, which is neutral.
(2) The acid tries to turn the litmus paper red and the alkali just turns it blue again at the same time.
(3) The resulting solution is neutral, so litmus paper does not react.
(A) (1) only
(B) (2) only
(C) (1) and (3) only
(D) (2) and (3) only
3. Which of the following statements about acids is/are correct?
(1) They can be used to clean marble tables.
(2) They taste sour.
(3) They can turn pH paper orange or red.
(A) (1) only
(B) (2) only
(C) (1) and (3) only
(D) (2) and (3) only
4. Which of the following combinations is INCORRECT?
Alkali / Acid(A) / Lime water / Coke
(B) / Sodium hydroxide / Orange juice
(C) / Toothpaste / Vinegar
(D) / Lemon juice / Ammonia solution
5. What is the colour change of a beaker of vinegar if universal indicator solution is added into it?
(A) from blue to red
(B) from colourless to blue
(C) remains colourless
(D) from colourless to red
6. Which of the following combinations is correct?
Substances / Approximate pH value(A) / Liquid soap / pH 12
(B) / Distilled water / pH 6.5
(C) / Black coffee / pH 5
(D) / Apple juice / pH 6
7. Which of the following is true for alkalis?
(A) They react with marble to give out carbon dioxide.
(B) They give us a slippery feel.
(C) They change pH paper red.
(D) They taste sour.
8. When some marble granules are put into vinegar, gas bubbles are given off from the marble granules. Which of the following is the correct explanation?
(A) Marble is composed of sodium carbonate. It reacts with vinegar to give out nitrogen.
(B) Marble is composed of calcium carbonate. It reacts with vinegar to give out carbon dioxide.
(C) Marble is composed of calcium. It reacts with vinegar to give out oxygen.
(D) Marble is composed of zinc. It reacts with vinegar to give out hydrogen.
9. In neutralisation process,
(1) carbon dioxide gas is given off.
(2) salt and water are formed.
(3) an acidic substance is formed.
(A) (1) only
(B) (2) only
(C) (1) and (3) only
(D) (2) and (3) only
10. Which of the following is/are the use(s) of alkalis?
(1) Treatment of industrial waste containing acids.
(2) Remove stains on bathroom fixtures.
(3) Regulation of pH values of soil.
(A) (1) only
(B) (2) only
(C) (1) and (3) only
(D) (2) and (3) only
11. The following is a pH scale. Which letter indicates the pH of black coffee?
12. An acid is added to some marble granules. What gas will be given out?
(A) oxygen
(B) hydrogen
(C) carbon dioxide
(D) nitrogen
13. Iron reacts with dilute hydrochloric acid to give out
(A) oxygen gas.
(B) carbon dioxide gas.
(C) nitrogen gas.
(D) hydrogen gas.
14. During neutralisation,
(A) the only product is water.
(B) a salt and water are formed.
(C) the only product is a salt.
(D) a salt, carbon dioxide gas and water are formed.
15. If strong acid is accidentally spilt on your hand, what should you do?
(1) You must stay calm.
(2) You should report it to your teacher immediately.
(3) You should wash the affected area with an alkali immediately.
(A) (1) and (2) only
(B) (1) and (3) only
(C) (2) and (3) only
(D) (1), (2) and (3)
16. We can measure the pH value of a solution by using
(1) universal indicator solution.
(2) litmus solution.
(3) a pH meter.
(A) (1) only
(B) (2) only
(C) (1) and (3) only
(D) (2) and (3) only
17. Which of the following cleansing agents contain(s) alkalis for removing dirt and grease?
(1) toilet cleaner
(2) oven cleaner
(3) glass cleaner
(A) (1) only
(B) (2) only
(C) (1) and (3) only
(D) (2) and (3) only
18. Gastric juice contains hydrochloric acid. What is/are the function(s) of hydrochloric acid in gastric juice?
(1) It kills bacteria in food.
(2) It reduces the friction between food and stomach inner wall to avoid hurt.
(3) It provides an acidic medium for enzymes in the stomach to digest food.
(A) (1) only
(B) (2) only
(C) (1) and (3) only
(D) (2) and (3) only
19. Which of the following is/are true for universal indicator solution?
(1) It is purple in neutral solutions.
(2) It is red in strong acids.
(3) It is blue in strong alkalis.
(A) (1) only
(B) (1) and (3) only
(C) (2) and (3) only
(D) (1), (2) and (3)
20. Which of the following liquids has a pH value around 4?
(A) hydrochloric acid
(B) glass cleaner
(C) apple juice
(D) salt water
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